You will need a Digital Optical (Toslink) to Analog Audio (3.5mm or RCA) Converter for this setup to work, since your TV doesn´t provide an analog audio output signal and probably doesn´t work the USB part of the Rocketfish wireless receiver.
With the converter you plug in a toslink optical cable from your TV the converter and from the converter an analog RCA or 3.5mm audio cable to the rocketfish receiver.
This would be such a converter (should be cheaper somewhere else):
https
/www.bestbuy.ca/en-ca/product/insten-digital-optical-toslink-to-analog-with-3-5mm-audio-converter-black/10656127.aspx